Shell material: plasticPower supply: built in lithium battery; duration: 5 hours.Size: 112x112x145mm; weight: 879gFunctions: radio voice prompt, alarm clock, dustproof and anti dropping waterproof.You can set the volume of your phone to a small section, and you can connect and use your phone and laptop without any problems. It is charging very fast and lasts for a long time. This speaker plays quite loud and can be heard from a great distance. It is portable so you can carry it with you.